If you have a Windows 64 bit version you might have to add read and write properties to both, the Program File CK2 directory as well as the documents directory.

If the game shows an error try once to delete the settings.txt from the documents/ck2/mod/Game of Thrones directory.

This game takes a very long time to play 12+ hours to start. Read the instrucitons on how to get vassals and how to inherit claims before you play. If you play with winter there will be non stop popups about the freezing cold so you might deactivate seasons (everything they do is add a malus to your stuff)

It's a laptop with an integrated Graphic Card. I can easily run Diablo 3 and Star Wars The Old Republic, but not CK2. I can't even run Baldur's Gate Enhanced Edition and I have difficulties running Minecraft. Integrated Graphic Cards are unpredictable.

I'm in the same boat... can't run CK2, but works with CK1 like a charm. I fucking love the mod for CK1! I wish there was a more updated version (that included Essos and perhaps ADWD players/factions), but I still love it!